Weather on March 21
Vacaville, CA
55 Years of Data
Avg High
69°F
Avg Low
44°F
Warmest
2026
70°F avg
Coldest
1975
45°F avg
About This Date
March 21st in Vacaville, CA typically brings mild spring weather, with average highs around 69°F and lows near 44°F — a 25°F daily swing. Over 56 years of records, the warmest March 21st was in 2026 (70°F average), while the coldest was 1975 (45°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 30% of March 21st dates historically, with the wettest March 21st recording 4.01" of rain. The last decade has been 2.7°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.7°F cooler on this date compared to 20-30 years ago.
Planning for March 21st in Vacaville, CA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 87° | 54° | 70° | — | — |
| 2025 | 64° | 40° | 52° | — | — |
| 2024 | 70° | 46° | 58° | — | — |
| 2023 | 52° | 47° | 49° | 4.01" | — |
| 2022 | 85° | 41° | 63° | — | — |
| 2021 | 71° | 43° | 57° | — | — |
| 2020 | 66° | 38° | 52° | — | — |
| 2019 | 67° | 36° | 51° | — | — |
| 2018 | 67° | 50° | 58° | 1.73" | — |
| 2017 | 66° | 54° | 60° | 3" | — |
| 2016 | 63° | 49° | 56° | 0.28" | — |
| 2015 | 75° | 50° | 63° | — | — |
| 2014 | 74° | 43° | 58° | — | — |
| 2013 | 69° | 41° | 55° | — | — |
| 2012 | 71° | 45° | 58° | — | — |
| 2011 | 60° | 40° | 50° | 0.15" | — |
| 2010 | 73° | 46° | 60° | — | — |
| 2009 | 61° | 50° | 55° | — | — |
| 2008 | 70° | 40° | 55° | — | — |
| 2007 | 72° | 46° | 59° | 0.03" | — |
| 2006 | 56° | 40° | 48° | — | — |
| 2005 | 61° | 47° | 54° | 3.33" | — |
| 2004 | 80° | 49° | 64° | — | — |
| 2003 | 71° | 41° | 56° | — | — |
| 2002 | 71° | 43° | 57° | — | — |
| 2001 | 78° | 51° | 65° | — | — |
| 2000 | 75° | 52° | 63° | — | — |
| 1999 | 61° | 42° | 51° | 0.1" | — |
| 1998 | 67° | 50° | 58° | 0.43" | — |
| 1997 | 79° | 57° | 68° | — | — |
| 1996 | 74° | 46° | 60° | — | — |
| 1995 | 57° | 42° | 50° | 0.23" | — |
| 1994 | 65° | 40° | 52° | — | — |
| 1993 | 75° | 45° | 60° | — | — |
| 1992 | 68° | 45° | 56° | — | — |
| 1991 | 59° | 38° | 48° | — | — |
| 1990 | 78° | 50° | 64° | — | — |
| 1989 | 71° | 47° | 59° | — | — |
| 1988 | 75° | 50° | 63° | 0.15" | — |
| 1987 | 56° | 39° | 47° | 1.04" | — |
| 1986 | 74° | 42° | 58° | — | — |
| 1985 | 69° | 34° | 51° | — | — |
| 1984 | 72° | 39° | 55° | — | — |
| 1983 | 60° | 43° | 51° | 1.12" | — |
| 1982 | 62° | 32° | 47° | — | — |
| 1981 | 66° | 36° | 51° | 2.13" | — |
| 1980 | 65° | 44° | 54° | — | — |
| 1979 | 60° | 37° | 49° | — | — |
| 1978 | 67° | 53° | 60° | 0.03" | — |
| 1977 | 78° | 38° | 58° | — | — |
| 1976 | 77° | 42° | 60° | — | — |
| 1975coldest | 57° | 34° | 45° | 2.21" | — |
| 1974 | 68° | 38° | 53° | — | — |
| 1973 | 55° | 41° | 48° | 1.19" | — |
| 1972 | 75° | 44° | 60° | — | — |
| 1971 | 74° | 38° | 56° | — | — |
56 years of data from VACAVILLE/NUT TREE AP ASOS